The track foundation is preloaded by multiple wheel loads due to the train weight and, as the pad and ballast are nonlinear, their stiffness depends upon the preload in them. Due to the influence of these resilient components of the track, the track vibration is affected by the wheel loads. It is also affected by the wheel/rail interactions. In this article the preloads in the pad and ballast are calculated by considering the nonlinear properties of the track foundation, and thus the preloaded pad and ballast stiffnesses are determined. The vibration properties are explored for the track under multiple wheel loads and multiple wheel/rail interactions by comparing the results from different track models with and without these effects. It is found that the point receptance of the track is reduced and the vibration decay rate is enhanced at low frequencies due to the wheel loads. The effects of the wheel/rail interactions are most significant for frequencies 400-2000 Hz. Because of the wheel/rail interactions, the point receptance fluctuates and the vibration decay is enhanced in the regions around the wheels.
[1]
T. X. Wu,et al.
THE EFFECTS OF LOCAL PRELOAD ON THE FOUNDATION STIFFNESS AND VERTICAL VIBRATION OF RAILWAY TRACK
,
1999
.
[2]
David Thompson,et al.
Developments of the indirect method for measuring the high frequency dynamic stiffness of resilient elements
,
1998
.
[3]
D. Thompson.
Wheel-rail Noise Generation, Part I: Introduction And Interaction Model
,
1993
.
[4]
A. Igeland,et al.
Railhead Corrugation Growth Explained by Dynamic Interaction between Track and Bogie Wheelsets
,
1996
.
[5]
K. L. Johnson,et al.
The Dynamic Response of Railway Track to High Frequency Vertical Excitation
,
1982
.
[6]
Klaus Knothe,et al.
Modelling of Railway Track and Vehicle/Track Interaction at High Frequencies
,
1993
.
[7]
Paul J. Remington,et al.
Wheel/rail rolling noise, I: Theoretical analysis
,
1987
.